Need a migration to ensure that Distribution units have a default value of '' for variant.
The Distribution model object defaults the variant to ''. However, units created before conversion to mongoengine can have a variant of null. To ensure proper comparison, a migration needs to be written to make the unit keys consistent in the DB.
Moves migration 31 -> 33 so migrations can be introduced in 2.8.z
This allows the fix for issue 1979 to become migration 31 and the fix for issue 1955 to become migration 32. Both of those will be introduced in 2.8-dev and merged forward to master.
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